Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ffe0ceff9ca0ba…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 01:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7cbd1d206a58e785fe3aee3a0e8667ef SHA-1: 633356ce3bfc9b2fe82a382bbce76fef098080ae SHA-256: 41ffe0ceff9ca0ba0dee95015d191340b039cbf8737a0fc056ebe5228848195b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and external URI firings point towards an attack pattern involving directing users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=a30+screen+resolution PDF link annotation
    • http://feriaalainversa.com/uploaded/files/87306709182.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/47265689342.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/53871879495.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/08/37417024660.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/76988570654.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0d8596e9812285defd5f34b4fc3df7fe/vapetutidinepaferodagiru.pdfIn PDF document text
    • http://risme.vn/files/37516556415.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/gajawifobi.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/tanalukukawekaleladajogad.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/vopudibakebikadukufezuzoz.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/jotewaratuj.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/5706938151.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/geratutetifigakasowem.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/45659434804.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/47101005102.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/rukujetep.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/68067109793.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/japutukemes.pdfIn PDF document text
    • http://balalajka.nu/media/mabasoxoxevaxebiwelovifug.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/5370969329.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396a79bf7c3---fonifopox.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/ferajiligasujimobolete.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/96641542545.pdfIn PDF document text
    • https://grandegroup.net/files/vewuwurojojenamuviz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 18692 bytes
SHA-256: 2cfda9b32ed3d4d2ea7a67a72b8df727d95311996b22cc6cc88c1d82f50db608
font_01_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001255a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255A 10436 bytes
SHA-256: 16842dbb0c41d4fcb16197c5bfac02b44670c060e5e24bfafc7c91aa9544ed50

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